不平衡2.5D碳纤维机织预制体偏轴拉伸性能  

Bias-tensile properties for the unbalanced 2.5D carbon fibre woven preforms

作　　者：关留祥 李嘉禄[1] 焦亚男[1] 杨志 房倩倩[1] GUAN Liuxiang;LI Jialu;JIAO Ya’nan;YANG Zhi;FANG Qianqian(Key Laboratory of Advanced Textile Composites(Ministry of Education),Institute of Textile Composites,School of Textile Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China)

机构地区：[1]天津工业大学纺织科学与工程学院复合材料研究所先进纺织复合材料教育部重点实验室

出　　处：《复合材料学报》2020年第2期293-301,共9页Acta Materiae Compositae Sinica

基　　金：天津市高等学校创新团队项目(TD13-5043)

摘　　要：通过偏轴拉伸实验研究了因纱线细度变化而引起的不平衡2.5D碳纤维机织预制体(2.5D CFWPs)的面内剪切变形性能,实验材料包括4组不平衡2.5D CFWPs试样和1组平衡2.5D CFWPs试样。观察了不平衡2.5D CFWPs试样的典型宏观变形形貌和细观结构变化;对比了不平衡试样和平衡试样的剪切角和拉伸载荷变化;通过归一化处理,详细分析了纱线细度对预制体面内剪切变形的影响。结果表明:不平衡2.5D CFWPs试样典型变形形貌呈左右不对称形态,且纱线呈"S"型或"Z"型抽拔;经纬纱细度组合为792 tex×396 tex(表示经纱细度为792 tex,纬纱细度为396 tex)和396 tex×792 tex的不平衡2.5D CFWPs试样的偏轴拉伸性能基本相同,另两组不平衡试样(经纬纱细度组合为198 tex×792 tex和792 tex×198 tex)的偏轴拉伸性能也基本相同;平衡试样的拉伸载荷明显大于不平衡试样,在达到剪切锁紧后,平衡试样载荷快速上升,不平衡试样载荷上升缓慢;对拉伸载荷归一化处理后,剪切角小于20.81°时, 5组2.5D CFWPs试样剪切力基本相同,在20.81°~30.02°时, 4组不平衡试样剪切力基本相同。The in-plane shear properties for the unbalanced 2.5 D carbon fibre woven preforms(2.5 D CFWPs) due to the changing of yarn linear density were investigated by the bias-tensile test. The test materials including 4 kinds of unbalanced 2.5 D CFWPs and 1 kind of balanced 2.5 D CFWPs. The typical bias-tensile modes and meso-structures were observed;The shear angles and bias-tensile load of balanced and unbalanced samples were compared and analyzed;Normalized method was used to analyze the influence of yarn linear density on the in-plane shear properties. The results show that the typical bias-tensile modes of the unbalanced 2.5 D CFWPs are asymmetric S-shape or Z-shape. The bias-tensile properties of unbalanced 2.5 D CFWP samples with yarn linear density of 792 tex×396 tex(the warp is 792 tex and the weft is 396 tex) are similar, the other 2 unbalanced samples are similar too;The bias-tensile load of the balanced samples is larger than the unbalanced, After locking angle, the bias-tensile load of the balanced samples is rising rapidly and the unbalanced is rising slowly;The normalized shear forces of the all 5 kinds of 2.5 D CFWP samples are similar when the shear angle is less than 20.81°, and the 4 kinds of unbalanced samples are similar when the shear angle is between 20.81°-30.02°.

关 键 词：2.5D机织 预制体 偏轴拉伸 变形 剪切角 

分 类 号：TB332[一般工业技术—材料科学与工程]